Climate change activist Greta Thunberg reacts during a news conference during COP25 climate summit in Madrid, Spain, December 9, 2019. (Photo by Juan Medina/Reuters)

Audrey Lu and Misha Mitrofanov of the United States compete in the Pairs Short Program during day 1 of the ISU Grand Prix of Figure Skating Rostelecom Cup at Megasport Arena on November 15, 2019 in Moscow, Russia. (Photo by Maxim Shemetov/Reuters)

People and Nature category winner: Why did the sloth cross the road? by Andrew Whitworth (Osa Conservation and University of Glasgow), taken in Osa Peninsula, Costa Rica. “I was driving out from the Osa Peninsula, located on the southern Pacific coast of Costa Rica on a dark, stormy day. This female three-toed sloth (Bradypus variegatus) had luckily just about made it across the road, and the drivers of the Toyota on this occasion had spotted her in good time”. (Photo by Andrew Whitworth/2019 British Ecological Society Photography Competition)

A cosplayer dressed as Domino attends 2019 Comic-Con International on July 20, 2019 in San Diego, California. (Photo by Quinn P. Smith/Getty Images)

Hungarian model Barbara Palvin arrives for the 2019 CFDA fashion awards at the Brooklyn Museum in New York City on June 3, 2019. (Photo by Angela Weiss/AFP Photo)

A dog dressed up for a show sits backstage during the 16th annual New York Pet Fashion Show on February 7, 2019 in New York City. (Photo by Johannes Eisele/AFP Photo)

Transgender model and musician Jessica Cortez reacts as she is prepared before walking in the CHULO underwear show during New York Fashion Week, which raised money for transgender and cisgender young women victims of violence, in New York, U.S., February 7, 2019. (Photo by Andrew Kelly/Reuters)

A model presents a creation from the Chromat collection during New York Fashion Week in New York, U.S., February 8, 2019. (Photo by Caitlin Ochs/Reuters)